You can experiment with FUSE mount options: halo-latency & halo-min-replicas
halo-latency: The threshold below which all other clients will
consider children (bricks) connected.
halo-min-replicas: The minimum number of replicas which are to
be enforced regardless of latency specified in the above 3 options.
If the number of children falls below this threshold the next
best (chosen by latency) shall be swapped in.
consider children (bricks) connected.
halo-min-replicas: The minimum number of replicas which are to
be enforced regardless of latency specified in the above 3 options.
If the number of children falls below this threshold the next
best (chosen by latency) shall be swapped in.
If you have one brick per site set halo-min-replicas to 1 and halo-latency very low so it will write to the local brick (watch that fuse connects to local gluster - it tends to mount to remote on boot);
then files written will "heal" to the other bricks on a background. Heal performance is pretty solid.
I wouldn't do it for VMs
With my clusters around 10ms max latency I dont mind slow writes to cluster.
Real problem are reads from cluster as it does all attr queries 20 times each file,
and if you have maildir 100k emails in a folder ...
I had to write overlay fuse file system to direct reads directly to the brick through the kernel, bypassing all gluster fuse stuff:
all reads fly, and writes go regular way https://github.com/lavdnone/unionfs-fuse
You can also look in to Syncthing - surprisingly made on Go it is pretty solid. Especially for 2 replicas you want.
Shoot own discovery server on each node or on some cloud and have your sites sync with file change monitoring 0 delay.
v
On Wed, Oct 17, 2018 at 1:42 AM Oğuz Yarımtepe <oguzyarimtepe@xxxxxxxxx> wrote:
Any idea about the Halo configuration? Didn't find any documentation about it.On Wed, Oct 17, 2018 at 1:10 AM Vlad Kopylov <vladkopy@xxxxxxxxx> wrote:if you going for redundancy go for 3 full nodes, arbiter setup seen bugsdoubt anything good will come out of using NFSif you doing websites use VMs as hypervisors are using libgfapior implement libgfapi in your app directlyvOn Sun, Oct 14, 2018 at 2:13 PM Oğuz Yarımtepe <oguzyarimtepe@xxxxxxxxx> wrote:Hi,_______________________________________________I am trying to replicate nfs mount areas between to sites that will work active active. I was checking the methods that i can use via GlusterFS and it seems replication should be the way. I am not sure how many nodes should i use fo replication. I may need to make maintenance on the GlusterFS servers and i don't want to cause server 500 failures because of inexistance of mount areas. Any tips? Should i use arbiter?
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